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Equity Items - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Unrealized translation gain (loss), before tax	$ 7	$ 3	$ (7)	$ (37)
Unrealized translation gain (loss), net of tax	7	3	(7)	(37)
Adjustment of unrecognized prior service cost (credit), before tax				(7)
Adjustment of unrecognized prior service cost (credit), tax				1
Adjustment of unrecognized prior service cost (credit), net of tax				(6)
Total other comprehensive income (loss), before tax	7	3	(7)	(44)
Total other comprehensive income (loss), tax				1
Other comprehensive income (loss)	$ 7	$ 3	$ (7)	$ (43)

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Amount, before tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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